sfx2000
Part of the Furniture
Really short summary of the papers I'm linking below;
Interesting reading below:
http://eprints.networks.imdea.org/1...f_a_wlan_ieee_802.11ad_model_in_ns_3_2016.pdf
https://cdn.rohde-schwarz.com/pws/d...ation_notes/1ma220/1MA220_2e_WLAN_11ad_WP.pdf
Alt Link for the Rohde and Schwarz paper - https://www.rohde-schwarz.com/de/ap...-beu-60-ghz-application-note_56280-50625.html
http://cp.literature.agilent.com/litweb/pdf/5990-9697EN.pdf
Enjoy!
- On the PHY, a single carrier data stream with 16-QAM modulation at the high end is used for raw data speeds of around 4 GBit/s.
- There is a Low Power Single Carrier PHY - the main difference here is lower modulation schemes
- Optionally - For higher speeds up to 7 Gbit/s, Orthogonal Frequency Division Multiple Access (OFDM) with 355 sub-carriers and 64-QAM modulation at the high end are used.
- Four PHY's can be in use concurrently - the Control PHY is required - the Single Carrier PHY is common for many, the OFDM PHY is higher bandwidth, but at a cost of complexity and power, and there is the Low Power PHY which is single carrier, but lower requirements
- Data Link speeds, similar to other 802.11 implementation will be quite a bit slower
- PHY bandwidth is 2 GHz - for all PHY specs - SC/OFDM/LP-SC and of course the mandatory Control PHY
- The Control PHY is a much clearer delineation between control (management) and data planes - this is a clear difference with 802.11 a/b/g/n/ac
- Beamforming is part of the specification, as 60GHz by nature is directional, hence the name: ‘Directional Multi-Gigabit’ DMB PHY.
- The PHY itself is much simpler compared to 11ac - mostly because there is no legacy to be concerned with - it's greenfield technology
- Should note that currently with 60GHz and 802.11ad - everything is Single User, Single Input/Output - so in 802.11 speak - it is SU-SISO
- Signals can’t penetrate walls, in fact, even a piece of paper may significantly impair or block WiGIG - one should consider it more like a light bulb in the room - anywhere the light touches directly, that's pretty much the coverage of 11ad
- Primary Use Case - In-room coverage over a distance of 10 meters or less
- On the MAC layer, and here's where at some point we might see some of the innovation in 11ad find it's way back into the WiFi arena
- Scheduling and Coordination - transmissions are separated into beacon intervals and each interval has zones which are exclusively used for sending beacons in different directions (due to the directional nature of signals at 60 GHz), for beamforming preparation and for sending data packets.
- Fast Transfer Function - some might have missed this snippet - it's part of the standard to continue data transmission in the 2.4 / 5 GHz band when the 60 GHz link suddenly fails. Likewise, it can also be used to transfer an ongoing data stream back to 60 GHz when the signal is redetected.
Interesting reading below:
http://eprints.networks.imdea.org/1...f_a_wlan_ieee_802.11ad_model_in_ns_3_2016.pdf
https://cdn.rohde-schwarz.com/pws/d...ation_notes/1ma220/1MA220_2e_WLAN_11ad_WP.pdf
Alt Link for the Rohde and Schwarz paper - https://www.rohde-schwarz.com/de/ap...-beu-60-ghz-application-note_56280-50625.html
http://cp.literature.agilent.com/litweb/pdf/5990-9697EN.pdf
Enjoy!
Last edited: